Influence of Sea Level Pressure on Inter-Annual Rainfall Variability in Northern Senegal in the Context of Climate Change

This study examines the inter-annual variability of rainfall and Mean Sea Level Pressure (MSLP) over west Africa based on analysis Global Precipitation Climatology Project (GPCP) National Center for Environmental Prediction/National Atmospheric Research (NCEP/NCAR) Reanalysis respectively. An interconnection is found in this region, between anomaly (over Azores St. Helena High) monthly mean precipitation during summer (June to September: JJAS). We also that northern Senegal (15°N - 17°N; 17°W 13°W) SLP north strong; wind converges at 200 hPa corresponding position African Easterly Jet (AEJ) rotational 700 (corresponding coming from north-east negative. In related with opposite sign. The Empirical Orthogonal Functions (EOF) presented, including spectrum pressures 40°N 50°W 25°W) south (40°S 10°S 40°W 0°E). dominant EOF Pressures Atlantic Ocean GPCP represents about 62.2% 69.4% variance, second third EOFs pressure account 24.0% 6.5% represent 12.5% 8.9% Wet years were associated anomalous low-pressure areas as opposed dry which exhibited an high-pressure area same region. On other hand, South Atlantic, opposition noted. wavelet method applied showings north, our area. indices prove be very consistent, especially intervals high variance.